x1, y1, x2, y2 = map(float, input().split())
print("{:.5f}".format(((x2-x1)**2 + (y2-y1)**2)**0.5)) x1, y1, x2, y2 = map(float, input().split()) x1 map(float, input().split()) map float input().split() ().split () input split y1 x2 y2 print("{:.5f}".format(((x2-x1)**2 + (y2-y1)**2)**0.5)) print "{:.5f}".format(((x2-x1)**2 + (y2-y1)**2)**0.5) "{:.5f}".format "{:.5f}" format ((x2-x1)**2 + (y2-y1)**2)**0.5 (x2-x1)**2 + (y2-y1)**2 (x2-x1)**2 x2-x1 x2 x1 2 (y2-y1)**2 y2-y1 y2 y1 2 0.5 x2, y2 = map(float, input().split()) map(float, input().split()) x2 y1, x2, y2 = map(float, input().split()) map(float, input().split()) y1 y2 = map(float, input().split()) map(float, input().split()) y2 x1, y1, x2, y2 = map(float, input().split()) map(float, input().split()) x1
x1, y1, x2, y2 = map(float, input().split())
print("{:.5f}".format(((x2-x1)**2 + (y2-y1)**2)**0.5))
